<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
    </head>
    <body>
        <input id="input" data-bind="demo">
        <div id="output" data-bind="demo"></div>
        <button id="random">随机数</button>
        <script type="text/javascript">
            
        </script>
    </body>
</html>